The function of the pressure switch is to turn the heater off if the pump stops
operating or if there is a restricted water flow (dirty filter, obstruction in the spa
plumbing etc.).
The pressure switch has been preset at the factory to operate properly with your
spas specific plumbing. Adjustment or other service may be required if you
observe a flow related problem (FL on the spaside display). If adjustment is
required, follow the next steps carefully.
IMPORTANT: After any pressure switch adjustment, it is important to test
the control by turning on the pump low speed and heater. While operating,
unplug the pump, the heater must turn off. If the heater stays on, plug the
pump back in and readjust the pressure switch to achieve proper operation.
1)
With power to system turned OFF, remove the wires from the pressure switch
terminals (secure wires safely to prevent any chance of electrical shock).
2)
Use temperature adjustment key to move “set point” temperature to its lowest
setting.
3)
Turn power to the system ON and activate the low-speed pump.
4)
Place an Ohmmeter across the pressure switch terminals to verify an OPEN
circuit.
5)
Rotate the pressure switch adjustment screw counter-clockwise until the
Ohmmeter indicates a CLOSED circuit.
6)
Turn pump OFF and verify that the pressure switch circuit is once again
OPEN.
7)
Turn power to the system OFF and reconnect pressure switch wires. Reapply
power to the system and operate the spa or hot tub as normal.
Adjustment
Hydro-Quip 1A Pressure Switch
HQ PT# 34-0178
Adjustment Screw - Slotted
Hydro-Quip 1A Pressure Switch
HQ PT# 34-0178A
Adjustment Screw
T25 Torx, 5/32
Allen Wrench or
small slotted screw
driver with a 5/32
tip.
Fixed Heater Pressure Switch Adjustment
20
SpaDepot.com
